public DataInputStream(InputStream in)
Creates a DataInputStream that uses the specified underlying InputStream.
in - the specified input stream
public final int read(byte[] b)
throws IOException
Reads some number of bytes from the contained input stream and stores them into the buffer array
b
. The number of bytes actually read is returned as an integer. This method blocks until input data is available, end of file is detected, or an exception is thrown.
If b is null, a NullPointerException is thrown. If the length of b is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.
The first byte read is stored into element b[0], the next one into b[1], and so on. The number of bytes read is, at most, equal to the length of b. Let k be the number of bytes actually read; these bytes will be stored in elements b[0] through b[k-1], leaving elements b[k] through b[b.length-1] unaffected.
The read(b) method has the same effect as:
read(b, 0, b.length)
read in class FilterInputStream
b - the buffer into which the data is read.
-1 if there is no more data because the end of the stream has been reached.
IOException - if the first byte cannot be read for any reason other than end of file, the stream has been closed and the underlying input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in, InputStream.read(byte[], int, int)
public final int read(byte[] b,
int off,
int len)
throws IOException
Reads up to
len
bytes of data from the contained input stream into an array of bytes. An attempt is made to read as many as
len
bytes, but a smaller number may be read, possibly zero. The number of bytes actually read is returned as an integer.
This method blocks until input data is available, end of file is detected, or an exception is thrown.
If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.
The first byte read is stored into element b[off], the next one into b[off+1], and so on. The number of bytes read is, at most, equal to len. Let k be the number of bytes actually read; these bytes will be stored in elements b[off] through b[off+k-1], leaving elements b[off+k] through b[off+len-1] unaffected.
In every case, elements b[0] through b[off] and elements b[off+len] through b[b.length-1] are unaffected.
read in class FilterInputStream
b - the buffer into which the data is read.
off - the start offset in the destination array b
len - the maximum number of bytes read.
-1 if there is no more data because the end of the stream has been reached.
NullPointerException - If b is null.
IndexOutOfBoundsException - If off is negative, len is negative, or len is greater than b.length - off
IOException - if the first byte cannot be read for any reason other than end of file, the stream has been closed and the underlying input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in, InputStream.read(byte[], int, int)
public final void readFully(byte[] b)
throws IOException
See the general contract of the
readFully
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readFully in interface DataInput
b - the buffer into which the data is read.
NullPointerException - if b is null.
EOFException - if this input stream reaches the end before reading all the bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final void readFully(byte[] b,
int off,
int len)
throws IOException
See the general contract of the
readFully
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readFully in interface DataInput
b - the buffer into which the data is read.
off - the start offset in the data array b.
len - the number of bytes to read.
NullPointerException - if b is null.
IndexOutOfBoundsException - if off is negative, len is negative, or len is greater than b.length - off.
EOFException - if this input stream reaches the end before reading all the bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final int skipBytes(int n)
throws IOException
See the general contract of the
skipBytes
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
skipBytes in interface DataInput
n - the number of bytes to be skipped.
IOException - if the contained input stream does not support seek, or the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
public final boolean readBoolean()
throws IOException
See the general contract of the
readBoolean
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readBoolean in interface DataInput
boolean value read.
EOFException - if this input stream has reached the end.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final byte readByte()
throws IOException
See the general contract of the
readByte
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readByte in interface DataInput
byte.
EOFException - if this input stream has reached the end.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final int readUnsignedByte()
throws IOException
See the general contract of the
readUnsignedByte
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readUnsignedByte in interface DataInput
EOFException - if this input stream has reached the end.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final short readShort()
throws IOException
See the general contract of the
readShort
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readShort in interface DataInput
EOFException - if this input stream reaches the end before reading two bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final int readUnsignedShort()
throws IOException
See the general contract of the
readUnsignedShort
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readUnsignedShort in interface DataInput
EOFException - if this input stream reaches the end before reading two bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final char readChar()
throws IOException
See the general contract of the
readChar
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readChar in interface DataInput
char.
EOFException - if this input stream reaches the end before reading two bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final int readInt()
throws IOException
See the general contract of the
readInt
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readInt in interface DataInput
int.
EOFException - if this input stream reaches the end before reading four bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final long readLong()
throws IOException
See the general contract of the
readLong
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readLong in interface DataInput
long.
EOFException - if this input stream reaches the end before reading eight bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
FilterInputStream.in
public final float readFloat()
throws IOException
See the general contract of the
readFloat
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readFloat in interface DataInput
float.
EOFException - if this input stream reaches the end before reading four bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
readInt(), Float.intBitsToFloat(int)
public final double readDouble()
throws IOException
See the general contract of the
readDouble
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readDouble in interface DataInput
double.
EOFException - if this input stream reaches the end before reading eight bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
readLong(), Double.longBitsToDouble(long)
@Deprecated public final String readLine() throws IOException
See the general contract of the
readLine
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readLine in interface DataInput
IOException - if an I/O error occurs.
BufferedReader.readLine(), FilterInputStream.in
public final String readUTF() throws IOException
See the general contract of the
readUTF
method of
DataInput
.
Bytes for this operation are read from the contained input stream.
readUTF in interface DataInput
EOFException - if this input stream reaches the end before reading all the bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
UTFDataFormatException - if the bytes do not represent a valid modified UTF-8 encoding of a string.
readUTF(java.io.DataInput)
public static final String readUTF(DataInput in) throws IOException
Reads from the stream
in
a representation of a Unicode character string encoded in
modified UTF-8format; this string of characters is then returned as a
String
. The details of the modified UTF-8 representation are exactly the same as for the
readUTF
method of
DataInput
.
in - a data input stream.
EOFException - if the input stream reaches the end before all the bytes.
IOException - the stream has been closed and the contained input stream does not support reading after close, or another I/O error occurs.
UTFDataFormatException - if the bytes do not represent a valid modified UTF-8 encoding of a Unicode string.
readUnsignedShort()
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